special edition of "nightline," tragedy at sandy hook, the search for solutions, continues from new york city with cynthia mcfadden. >> as the nation struggles to come to terms with the tragedy that struck sandy hook elementary school, new details are emerging about the 20-year-old shooter. tonight abc news confirmed that his parents have been separated since 2001 and he had not spoken to his father or older brother in the last two years. abc's chief investigative correspondent brian roth has the latest. >> reporter: in the last month of adam lanza's life family and friends say he would not leave the house. with his mother nancy, telling them she was losing control of her 20-year-old son. >> it was getting harder for her as time went on. >> reporter: nancy lanza was a regular at newtown bar and restaurant, my place where the owners say she told them about her struggles with adam's emotional and behavior problems for years. >> she was helping him all the time. she home schooled him and everything. so she, you know, i knew he was on medication but that's all i know. >> reporter: since her divor